Edwin e



(N0 Model.)

E. B. CARTER. GUTTBR FOR MINING MACHINES.

No. 430,989; Patented June 24, 1890.

FIG. I.

, t v I FIG.3.

UNITED STATES PATENT OFFICE.

EDIVIN E. CARTER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO JOHN S. SCULLY, OF SAME PLACE.

CUTTER FOR MINING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 430,989, dated June 24, 1890.

Application filed May 12, 1890. Serial No. 351,533. (No model.)

To all whom it may concern.-

Be it known that I, EDWIN E. CARTER, a citizen ofthe United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered strength and rigidity is attained, and whereby a sharp cutting-edge is more easily maintained.

In the accompanying drawings, forming a part of this specification, Figure l is a sectional end elevation of the tool, the plane of section being indicated by the line 00 00, Fig. 2. Fig. 2 is a view in side elevation. Fig. 3 is a sectional elevation of the tool on the line y y, Fig. 2; and Fig. is an end elevation.

It has been ascertained in practice that when the cutter comes in contact with a hard spot or knot in the coal the sudden resistance presented will sometimes cause a fracture or break extending from a point at or near the junction of the cutting-point 2 and the supplemental cutting-lip 5 diagonally across to a point below the outer end of the cutting-lip. In order to strengthen the tool or cutter, the portion of the tool forming the lip 5 is so swaged or bent as to interpose a curved brace 6 between the cutting-edge of the supplemental lip 5 and the portion of the tool inclosed in the socket or holder '7. This brace 6, as shown in Fig. 3, extends from the cutting-edge of the lip in a rearward direction, and then slightly forward to the general plane of the cutter, thereby presenting some what of an edgewise rather than a lateral resistance to the strains to which it is subjected. The increased strength and rigidity gained by this construction do not in any way increase the weight or size of the tool.

cutting-points will not have such a relation to the coal as to be most effective in cutting. In my improved tool, however, the cuttingedges of the lips 4 and 5 are located in the same plane passing through the axis of rotation of the tool, as shown in Fig. 4, and the cutting-points are so bent in opposite directions that their edges will be in or approximately in a common plane, but that such plane while passing through the axis of rotation of the tool will form an acute angle with the cutting-edges of the lips l and 5.

I claim herein as my invention- 1. A cutter having two cutting-points located at opposite sides of a central recess, a preliminary lateral cutting-lip located in a plane below one of said cutting-points, a supplemental lateral cuttinglip located on the opposite side of the axis of the cutter, with its outer end in a plane below that of the preliminary cutting-lip, and at a greater distance from the axis than the outer end of said preliminary lip, and extending to the base of the adjacent cuttingpoint and wholly below the plane of its outer end, and aeurved brace interposed between the cutting-edge of the supplemental lip and the portion of the cutter inclosed in the tool-holder, substantially as set forth.

2. A cutter having two cutting-points located at opposite sides of a central recess, and with their edges in or approximately in a common plane passing through the axis of rotation of the cutter, a preliminary lateral cutting-lip located in a plane below one of said cutting-points, and a supplemental lat-- eral cutting-lip located on the opposite side of the axis of the cutter, with its outer end in a plane below that of the preliminary cutting-lip and at a greater distance from the plane common to the edges of the cuttingaxis than the outer end of said preliminary points, substantially as set forth. 1o cutting-lip, and extending to the base of the In testimony whereof I have hereunto set adjacent cutting-point and wholly below the my hand.

plane of its outer end, the cutting-edges of x EDWIN E. CARTER. both of said lips lying in a common plane WVitnesses: passing through the axis of rotation of the R. H. \VHITTLESEY,

cutter and forming an acute angle With the DARWIN S. WOLCOTT. 

